Improved machine for cutting tubes



marked A.

' prevent its turning round.

NITED STATES PATENT OFFICE.

NICHOLAS THOMAS, OF CHICAGO, ILLINOIS.

IMPROVED MACHINE FOR CUTTING TUBES.

Specification forming part of Letters Patent No. 70,652, dated November 5, 1367.

To all whom, it may concern:

Be it known that I, NICHOLAS THOMAS, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Machines for Cutting Tubes; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable Others skilled in the art to make and use the samereference being had to the accompanying drawings, forming part Of this specication.

The object of this invention is to furnish a machine or tool for cutting Off the ends Of boiler-tubes or tubes for other purposes; and the invention consists in arranging in asuitable stock a cutting-tool which is forced outward with a screw by means of a double-inclined plane, as will be hereinafter described.

The drawing Figure l represents a longitudinal central section, showing the whole arrangement. Fig. 2 is a crossseetion through the line xx ofFig. l. Fig. 3 is an other crosssection through the line y y of Fig. l.

Similar letters of reference ind-icate like parts.

A represents the stock, which is formed of two'pieces united together near the middle, as seen vat a. The lower part of the stock is In this part Ais placed the cutter. In the other part of the stock (marked A) there is t-ted a hollow or socket screw, which is marked B. TO this part the handwheel C is attached, by which the screw B is turned. Into lthe hollow screw B is fitted another screw, D, thelower portion of which is square, or is arranged in some other way to This square portion passes through a square aperture in the end of A', as seen at b. v

E is the cutter, which, as seen in the drawings, is placed in a position at right angles with the stock and the screws B and D.

G is a block, which is dovetailed into the stock,and which may be removed and replaced by others of any required size to suit the tube to be cut. The Object of this block is to keep the side of the stock carrying the cutter near the side of the tube, thus allowing tubes of various sizes to be cut with the same cutter, and allowing the spring-block I to Operate as hereinafter described.

I, Fig. 2, is a stud, which is forced outward by a spring, as seen. This stud'is for the purpose of pressing the tube onto the slides G and H by bearing on the tube when the machine is in operation.

The studs seen in Fig. 3 (marked d) are pressed out'by springs, and are for the purpose of steadying the end of the stock in the tube. These spring-studs may be removed and replaced by Others, as may be desired.

It will be seen that the end of the cutter and the end of thescrew D are brought in contact and form together a double-inclined plane.

The two screws B and D are of different pitch, and in turning B it will enter the stock or descend intochamber of the stock faster than D in consequence of the difference in the pitch. This difference gives the feed to the cutter when the stock and screw D are turned round by the ratchet in Operating the machine.

While the cutting is being done the handwheel C is held still, or only allowed to rotate as the feed may require it, by forcing the inclined-or wedged-shaped end Of the screw D Onto the inclined surface or wedge-shaped end of the cutter.

The operation Of the parts is so plainly shown in the drawings that a further description is deemed unnecessary. It may be added, however, that the machine is Operated or revolved by a ratchet-wrench Or in sonne other convenient manner. The tube to be cutis represented in red. A stop-collar is also shown in the drawings, (marked J,) which is madeto slide on the stock and is fastened by a *set-` screw in any desired position.

What I claim as new, and desire to secure by Letters Patent, is

The construction and arrangement of the stock A and A, socket-screw B, screw D, having its lower end inclined below its square shank b, inclined horizontal cutter E, spring F, blocks G H, and horizont-al spring-knobs d I, as herein set forth, for the purpose specilied.

NICHOLAS THOMAS.

Vitnesses:

THOMAS SOMERVILLE, THOMAs C. JorrNsroNE. 

